When exposed to flame, treated fabrics produce a thin layer of char which stops flame spread and extinguishes the fire. Flame resistance is established once the treated material is completely dry. Meets NFPA-701, Steiner A.S.T.M.-E84-80 Tunnel Test and the F.A.A. Horizontal and Vertical Test. Apply with a pressure sprayer, cold fogger or airless paint sprayer. Not available for purchase in California